The ray gun is real ... or at least it will be soon. The U.S. Army is betting big on laser warfare -- designing, testing and perfecting ultra-precise weapons based on devastatingly powerful beams of light. And given recent developments, it's only a matter of time until the military has in its arsenal a weapon that until now has been the staple of science fiction -- the ray gun. Set your phasers to kill. Boeing, one of the Pentagon's top contractors, already has a laser weapon that will improve the military's ability to counter artillery, mortar, drone aircraft and even...